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Assertion:In some leguminous plant, the ...

Assertion:In some leguminous plant, the leaf base is swollen.
Reason:The swollen leaf base is called pulvinus.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Leaf base is the lowermost part of the leaf by which the leaf is joined to the node of the stem. It protects the young axillary bud. In many legumes it is swollen. The swollen leaf base is known as pulvinus. It is responsible for sleep and shock movements of certain leaves, e.g, Mimosa pudica and Cassia.
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Statement-A : In some leguminous plants, the leaf base swells and is called pulvinus. Statement-B : Pulvinus produces a cooling effect in the leaves by bringing fresh air to the leaf surface.

Select the CORRECT statements from the following : (P) In monocots , leaf base expands into sheath covering the stem partially or wholly (Q) In all leguminous plants, the leaf base may become swollen , which is called the pulvinus (R) The lamina or leaf blade bis green expanded part of the leaf with vein and veinlets (S) veins provide rigidity to leaf blade

Knowledge Check

  • A swollen leaf base is called

    A
    Pulvinus
    B
    Amplexicaul
    C
    Windge
    D
    Sheathing leaf base.

  • Pulvinate leaf base is found in

    A
    Lycopersicum
    B
    Trifolium
    C
    Nicotiana
    D
    Petunia.

  • Leaf base is sheathing in

    A
    Wheat
    B
    Maize
    C
    Grass
    D
    All the above.

    • Similar Questions

    Explore conceptually related problems

    Consider the following statements. In leguminous plants, leaf base becomes swollen, called pulvinus. The fleshy leaves of onion and garlic store food. . The buds in Australian Acacia tree become green and synthesise food. In Alstonia, leaves show alternate phyllotaxy. Of the above statements.

    Leafbase is swollen to form pulvinus in-

    Sheathing leaf bases is found in :-

    Pulvinus leaf base is not found in

    Consider the following statements : (a) In leguminous plants, leaf base becomes swollen, called pulvinus (b) The fleshy leaves of Onion and Garlic store food (c) The buds in Australian acacia become green and synthesise food (d) In Alstonia, leaves show alternate phyllotaxy. Of the above statements

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